CN115365951B

CN115365951B - Polishing device for water turbine blade

Info

Publication number: CN115365951B
Application number: CN202210904379.3A
Authority: CN
Inventors: 邹昊; 李超; 徐文娟; 朱钰; 夏栋梁
Original assignee: Sichuan Huaneng Fujiang Hydropower Co Ltd
Current assignee: Sichuan Huaneng Fujiang Hydropower Co Ltd
Priority date: 2022-07-29
Filing date: 2022-07-29
Publication date: 2023-08-01
Anticipated expiration: 2042-07-29
Also published as: CN115365951A

Abstract

The invention discloses a polishing device for a water turbine blade, which comprises a polishing machine, wherein an output shaft is arranged, the output shaft is driven by a motor, and the end part of the output shaft is provided with a mounting hole; the connecting assembly comprises a mounting shaft, and the mounting shaft is provided with a connecting column matched with the mounting hole; the polishing assembly comprises a connecting shaft fixedly connected with the mounting shaft, a polishing disc connected with the connecting shaft, a connecting groove is formed in one end face of the polishing disc, and the polishing disc is connected with the connecting groove; one end face of the polishing disc is a complete plane, the blade can be polished, the other end face of the polishing disc is used for being installed on a polisher, and the end part of the connecting shaft is directly embedded into the connecting groove during installation; when the grinding disc is replaced, the annular ring is operated to rotate, so that the moving part moves towards the direction of the clamping pin, and the clamping pin is separated from the clamping pin hole under the action of the conical groove, so that the grinding disc can be detached; meanwhile, the connecting component is used for connecting the output shaft of the grinding machine with the grinding piece, and the grinding piece can be quickly detached and replaced.

Description

Polishing device for water turbine blade

Technical Field

The invention relates to the field of polishing, in particular to a polishing device for a water turbine blade.

Background

Hydroelectric power generation is a way of generating electricity, and the water energy utilized is mainly potential energy stored in a water body. The natural water flow is concentrated by a building to form a water head, and the natural water flow is collected and regulated by a reservoir; the basic equipment is a hydroelectric generating set. When water flows through the water turbine, the water turbine is pushed by the water flow to rotate, the water turbine drives the generator to generate electricity, mechanical energy is converted into electric energy, and then the electric power is sent to users through power transformation and transmission and distribution equipment.

However, when the hydraulic power generation blade is used in the prior art, the hydraulic power generation blade needs to be made into an amplitude and a plane, the traditional polishing sheet cannot be polished according to the required plane of the blade better, and the polishing sheet cannot be replaced conveniently when the polishing sheet is damaged, so that the polishing efficiency is affected.

Disclosure of Invention

This section is intended to summarize some aspects of embodiments of the invention and to briefly introduce some preferred embodiments, which may be simplified or omitted from the present section and description abstract and title of the application to avoid obscuring the objects of this section, description abstract and title, and which is not intended to limit the scope of this invention.

The present invention has been made in view of the above and/or problems occurring in the prior art.

Therefore, the technical problem to be solved by the invention is that the traditional polishing sheet cannot be polished well according to the required plane of the blade, and the polishing sheet cannot be conveniently replaced when the polishing sheet is damaged, so that the polishing efficiency is affected.

In order to solve the technical problems, the invention provides the following technical scheme: the polishing device for the water turbine blades comprises a polishing machine, wherein an output shaft is arranged, the output shaft is driven by a motor, and a mounting hole is formed in the end part of the output shaft;

the connecting assembly comprises a mounting shaft, and the mounting shaft is provided with a connecting column matched with the mounting hole;

the polishing assembly comprises a connecting shaft fixedly connected with the mounting shaft, a polishing disc connected with the connecting shaft, a connecting groove is formed in one end face of the polishing disc, and the polishing disc is connected with the connecting groove.

As a preferable mode of the polishing device for the turbine blade of the invention, wherein: the connecting shaft is characterized in that a through chute is formed in the tail end of the connecting shaft along the radial direction, two clamping pins are symmetrically arranged in the chute, a chamfer is formed at the end part, far away from the axis of the connecting shaft, of each clamping pin to form a wedge shape, and an elastic piece is arranged between the two clamping pins.

As a preferable mode of the polishing device for the turbine blade of the invention, wherein: the side of the connecting groove is provided with a clamping pin hole.

As a preferable mode of the polishing device for the turbine blade of the invention, wherein: the connecting shaft is internally provided with a circular groove, the bayonet lock is connected with a cylindrical pin, and the cylindrical pin is positioned in the circular groove.

As a preferable mode of the polishing device for the turbine blade of the invention, wherein: the round groove is internally provided with a moving part, one end face, close to the bayonet lock, of the moving part is provided with a conical groove, and the cylindrical pin is located in the conical groove.

As a preferable mode of the polishing device for the turbine blade of the invention, wherein: the end part of the cylindrical pin is provided with a conical boss, and the conical boss is contacted with the side surface of the conical groove.

As a preferable mode of the polishing device for the turbine blade of the invention, wherein: the connecting shaft is characterized in that an annular groove is formed in the outer side of the connecting shaft, an annular ring is arranged in the annular groove, a strip-shaped groove is formed between the annular groove and the round groove, a spiral groove is formed in the inner side of the annular ring, an adjusting pin is arranged on the side face of the moving part, and the adjusting pin penetrates through the strip-shaped groove and is embedded into the spiral groove.

As a preferable mode of the polishing device for the turbine blade of the invention, wherein: the side surface of the mounting hole is provided with a rectangular groove, the rectangular groove extends to the end surface of the output shaft, the center of the rectangular groove is provided with a hinge groove, a rotating block is arranged in the rectangular groove, the center of the rotating block is provided with a rotating shaft, and the rotating shaft is connected with the hinge groove;

the connecting column is provided with a through hole which penetrates in the radial direction, two bolts are symmetrically arranged in the through hole, a limiting groove is formed in the through hole, a limiting block is arranged at one end of each bolt, which is positioned in the limiting groove, and a first spring is arranged between the two limiting blocks;

the one end that the rectangular groove kept away from the mounting hole is provided with along the radial spring groove of mounting hole, be provided with the second spring in the spring groove, second spring one end and turning block one end contact.

As a preferable mode of the polishing device for the turbine blade of the invention, wherein: a cylindrical groove with the diameter larger than that of the mounting hole is further formed in the output shaft, a movable disc is arranged in the cylindrical groove, and two upright posts are arranged on one end face of the movable disc;

the end part of the connecting column is provided with two jacks penetrating through the limiting groove, and the distance between the two jacks is consistent with the distance between the two upright posts;

the side surface of the cylindrical groove is provided with a guide groove extending along the axial direction, and the side surface of the movable disc is provided with a guide block embedded in the guide groove;

a third spring is arranged between the movable disc and the bottom of the cylindrical groove.

As a preferable mode of the polishing device for the turbine blade of the invention, wherein: the limiting blocks are provided with fixing holes, and when the two limiting blocks are furthest, the fixing holes are coaxial with the jacks and the stand columns.

The invention has the beneficial effects that: one end face of the polishing disc is a complete plane, the blade can be polished, the other end face of the polishing disc is used for being installed on a polisher, and the end part of the connecting shaft is directly embedded into the connecting groove during installation; when the grinding disc is replaced, the annular ring is operated to rotate, so that the moving part moves towards the direction of the clamping pin, and the clamping pin is separated from the clamping pin hole under the action of the conical groove, so that the grinding disc can be detached; meanwhile, the connecting component is used for connecting the output shaft of the grinding machine with the grinding piece, and the grinding piece can be quickly detached and replaced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:

FIG. 1 is a schematic view of a polishing device for a turbine blade according to an embodiment of the present invention;

FIG. 2 is a schematic view of an installation structure of a polishing disc in a polishing device for a turbine blade according to an embodiment of the present invention;

FIG. 3 is a schematic view of a polishing assembly of a polishing apparatus for a turbine blade according to an embodiment of the present invention;

FIG. 4 is a schematic view of a hydraulic turbine blade according to an embodiment of the present invention when connected by a polishing assembly of the polishing apparatus;

FIG. 5 is a schematic view of a hydraulic turbine blade polishing apparatus according to an embodiment of the present invention with a polishing assembly separated;

FIG. 6 is a schematic view of an exploded view of a connection assembly and a polishing assembly of a polishing apparatus for a turbine blade according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a polishing machine and a connecting assembly in a polishing device for a turbine blade according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a polishing machine and a connection assembly in a polishing device for a turbine blade according to an embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a process of separating an output shaft from a connection assembly in a polishing device for a turbine blade according to an embodiment of the present invention;

fig. 10 is a schematic structural view illustrating a process of separating an output shaft from a connection assembly in a polishing apparatus for a turbine blade according to an embodiment of the present invention.

Detailed Description

In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.

In the following detailed description of the embodiments of the present invention, reference is made to the accompanying drawings, which form a part hereof, and in which are shown by way of illustration only, and in which is shown by way of illustration only, and in which the scope of the invention is not limited for ease of illustration. In addition, the three-dimensional dimensions of length, width and depth should be included in actual fabrication.

Further still, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic may be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

Example 1

Referring to fig. 1 to 5, the present embodiment provides a polishing device for a water turbine blade, including a polishing machine 100, a connection assembly 200 and a polishing assembly 300, wherein the polishing machine 100 is provided with an output shaft 101, the output shaft 101 is driven by a motor, wherein the motor drives the output shaft 101 to be in the prior art, and details are not repeated.

Wherein the end of the output shaft 101 is provided with a mounting hole 101a; the connection assembly 200 includes a mounting shaft 201, the mounting shaft 201 being provided with a connection post 201a fitted with the mounting hole 101a; when connected, the connection post 201a is inserted into the mounting hole 101 a.

Wherein the sanding assembly 300 includes a coupling shaft 301 fixedly coupled to the mounting shaft 201, the coupling shaft 301 is preferably integrally formed with the mounting shaft 201 or coupled by welding. The polishing assembly 300 further comprises a polishing disc 302 connected with the connecting shaft 301, wherein the polishing disc 302 is made of a grinding wheel material, and the middle part of the polishing disc is embedded with a metal material, so that the polishing assembly is convenient to install.

One end surface of the polishing disc 302 is provided with a connecting groove 302a, and the connecting shaft 301 is connected with the connecting groove 302 a.

Preferably, the connecting shaft 301 and the connecting groove 302a may have a circular shape.

Further, a through chute 301a is radially provided at the end of the connecting shaft 301, two bayonet locks 303 are symmetrically provided in the chute 301a, a chamfer is provided at the end of the bayonet lock 303 far away from the axis of the connecting shaft 301 to form a wedge shape, and an elastic member 304 is provided between the two bayonet locks 303. The elastic member 304 is a pressure spring, and the bayonet 303 can be fully retracted into the chute 301 a. Correspondingly, the side surface of the connecting groove 302a is provided with a clamping pin hole 302b. The two bayonet holes 302b are also provided, when the end of the connecting shaft 301 is inserted into the connecting groove 302a to the bottom, the bayonet 303 just pops up and is embedded into the bayonet hole 302b, and the end of the bayonet 303 is wedge-shaped, so that the installation of the polishing disc 302 is completed.

Further, a circular groove 301b is provided in the connecting shaft 301, the circular groove 301b is penetrated with the sliding groove 301a, the bayonet 303 is connected with a cylindrical pin 303a, and the cylindrical pin 303a is located in the circular groove 301 b. Cylindrical pin 303a may also limit the complete disengagement of bayonet 303 from connecting shaft 301.

A moving member 305 is provided in the circular groove 301b, and the moving member 305 is disc-shaped and is movable in the axial direction in the circular groove 301 b. The moving member 305 is provided with a tapered groove 305a near an end face of the bayonet 303, and the cylindrical pin 303a is located in the tapered groove 305 a. In the initial state, the cylindrical pin 303a is located at the edge of the tapered slot 305 a.

Preferably, the end of cylindrical pin 303a is provided with a tapered boss 303b, and tapered boss 303b is in side contact with tapered slot 305 a.

Further, an annular groove 301c is provided on the outer side of the connecting shaft 301, an annular ring 306 is provided in the annular groove 301c, a strip-shaped groove 301d is provided between the annular groove 301c and the circular groove 301b, a spiral groove 306a is provided on the inner side of the annular ring 306, and the spiral groove 306a extends along the spiral line.

The moving member 305 is provided with an adjustment pin 305b on the side surface, and the adjustment pin 305b is inserted into the spiral groove 306a through the bar-shaped groove 301 d.

The linear movement of the displacement member 305 can thus be controlled by controlling the rotation of the annular ring 306.

In this embodiment, one end face of the polishing disc 302 is a complete plane, so that the blade can be polished, and the other end face of the polishing disc 302 is used for being installed on a polisher, and when the polishing disc is installed, the end part of the connecting shaft 301 is directly embedded into the connecting groove 302 a; when the grinding disc 302 is replaced, the annular ring 306 is operated to rotate, the moving part 305 is moved towards the bayonet 303, and the bayonet 303 is separated from the bayonet hole 302b under the action of the conical groove 305a, so that the grinding disc 302 can be detached.

Example 2

Referring to fig. 6 to 10, a second embodiment of the present invention is based on the previous embodiment, and is different from the previous embodiment in that:

the connecting column 201a can be inserted into the mounting hole 101a for connection, rectangular grooves 101b are formed in the side face of the mounting hole 101a, two rectangular grooves 101b are symmetrically formed and extend along the axial direction, the rectangular grooves 101b extend to the end face of the output shaft 101, namely to the contact surface between the output shaft 101 and the mounting shaft 201, a hinge groove 101c is formed in the center of the rectangular grooves 101b, a rotating block 102 is arranged in the rectangular grooves 101b, a rotating shaft 102a is arranged in the center of the rotating block 102, and the rotating shaft 102a is connected with the hinge groove 101 c. The rotating block 102 is in a long strip shape, can rotate by taking the rotating shaft 102a as an axis, and has a rotating range limited to the rectangular groove 101 b; it should be noted that the length of the rotating block 102 is not greater than the diagonal length of the rectangular groove 101b, and an arc-shaped groove is arranged at one end surface of the rectangular groove 101b near the inside, so that the rotating block 102 can swing, and the arc-shaped groove is centered on the rotating shaft 102 a; if no arcuate slot is provided, the length of the rotating block 102 should be no greater than the length of the rectangular slot 101 b.

Further, the connecting column 201a is provided with a through hole 201b penetrating in the radial direction, two pins 202 are symmetrically arranged in the through hole 201b, a limiting groove 201c is formed in the through hole 201b, the diameter of the limiting groove 201c is larger than that of the through hole 201b, a limiting block 202a is arranged at one end of the pin 202 located in the limiting groove 201c, and a first spring 203 is arranged between the two limiting blocks 202 a. The first springs 203 are pressure springs, that is, under the action of the first springs 203, the two pins 202 extend out of the through holes 201 b.

Wherein, the end of the rectangular groove 101b away from the mounting hole 101a is provided with a spring groove 101d along the radial direction of the mounting hole 101a, a second spring 103 is arranged in the spring groove 101d, and one end of the second spring 103 is contacted with one end of the rotating block 102. That is, in the initial state, the second spring 103 pushes one end of the rotating block 102 to deflect, and thus the rotating block 102 and the rectangular groove 101b form a groove similar to a diameter triangle shape.

It should be noted that the elastic force of the first spring 203 is much larger than the elastic force of the second spring 103.

Then, when the operation connection post 201a is inserted into the mounting hole 101a, first the latch 202 is retracted inwardly along the inclined surface formed by the rotation block 102, and when the latch 202 passes over the rotation shaft 102a, since the elastic force of the first spring 203 is much larger than that of the second spring 103, the rotation block 102 is rotated in the opposite direction, so that one end of the rotation block 102 compresses the second spring 103, and at this time the latch 202 is ejected along the inclined surface formed by the rotation block 102 and moves to contact with the end surface of the rectangular groove 101 b.

Further, a cylindrical groove 101e with a diameter larger than that of the mounting hole 101a is further formed in the output shaft 101, a movable disc 104 is arranged in the cylindrical groove 101e, the movable disc 104 can axially slide in the cylindrical groove 101e, and two upright posts 104a are arranged on one end face of the movable disc 104; the end of the connecting column 201a is provided with two insertion holes 201d penetrating to the limit groove 201c, and the distance between the two insertion holes is consistent with the distance between the two upright posts 104 a. The two posts 104a can be just plugged into the two receptacles. The side surface of the cylindrical groove 101e is provided with a guide groove 101f extending along the axial direction, and the side surface of the moving disc 104 is provided with a guide block 104b embedded in the guide groove 101 f; i.e. the mobile plate 104 cannot rotate. Wherein a third spring 105 is arranged between the moving disc 104 and the bottom of the cylindrical groove 101 e. The third spring 105 is a pressure spring, and when the connection post 201a is inserted into the mounting hole 101a, an end surface thereof contacts the movable disk 104.

The limiting blocks 202a are provided with fixing holes 202b, and when the two limiting blocks 202a are furthest away, the fixing holes 202b are coaxial with the insertion holes 201d and the upright posts 104 a. Therefore, during the process of inserting the connection post 201a into the mounting hole 101a and before the latch 202 reaches the end of the rectangular slot 101b, the distance between the two fixing holes 202b is smaller than the distance between the two posts 104a, and the two posts 104a can only be inserted into the insertion holes, when the latch 202 moves to the end of the rectangular slot 101b, the two fixing holes 202b exactly coincide with the two posts 104a, and at this time, the posts 104a are inserted into the fixing holes 202b under the action of the third spring 105, limiting the movement of the limiting block 202a toward the center of the connection post 201a, i.e., the connection position is fixed, because even if the mounting shaft 201 is pulled out, since the latch 202 is required to be contracted in the case of the rotating block 102 forming an inclined surface, the movement of the latch 202 is already limited by the posts 104a, and at this time the sander 100, the connection assembly 200 is not detachable.

The connecting column 201a is further provided with a straight hole 201e along the axial direction, a transmission rod 204 is arranged in the straight hole 201e, a large-diameter groove 201f is formed in the bottom of the straight hole 201e, the diameter of the large-diameter groove 201f is larger than that of the straight hole 201e, a limit stop 204a is arranged at one end, located in the large-diameter groove 201f, of the transmission rod 204, and a fourth spring 205 is arranged between the limit stop 204a and the end face, connected with the straight hole 201e, of the large-diameter groove 201 f. The fourth spring 205 is a compression spring, i.e. limits the extension of the transmission rod 204 from the connection post 201a.

Further, a transmission hole 201g is provided in the center of the connection column 201a, a transmission shaft 206 is provided in the transmission hole 201g, and a connection rod 204b connected to the transmission shaft 206 is provided in the limit stopper 204 a. The side of the mounting shaft 201 is provided with a long groove 201h penetrating the transmission hole 201g, and a deflector rod 206a connected with the transmission shaft 206 is arranged in the long groove 201 h. Therefore, when the sander 100 and the connection assembly 200 need to be separated, the operating lever 206a moves toward the sander 100, i.e., the transmission lever 204 is extended and pushes the moving plate 104 through transmission, and the upright post 104a is separated from the fixing hole 202b, and at this time, the mounting shaft 201 is pulled out, so that the plug 202 can be easily removed without restriction.

In this embodiment, connect the polishing subassembly through polisher 100, coupling assembling 200, make the installation of polishing subassembly more convenient with dismantle, specific: when the plug 202 passes over the rotating shaft 102a, the elastic force of the first spring 203 is far greater than that of the second spring 103, so that the rotating block 102 rotates reversely, one end of the rotating block 102 compresses the second spring 103, and at the moment, the plug 202 pops up along the inclined plane formed by the rotating block 102 and moves to be in contact with the end face of the rectangular groove 101 b; when the connection column 201a is inserted into the mounting hole 101a, the end face thereof contacts the movable disk 104; when the plug 202 moves to the end of the rectangular slot 101b, the two fixing holes 202b are just overlapped with the two upright posts 104a, and then the upright posts 104a are embedded into the fixing holes 202b under the action of the third spring 105; when the sander 100 and the connection assembly 200 need to be separated, the operating lever 206a moves toward the sander 100, so that the transmission lever 204 can extend and push the moving disc 104 through transmission, and the upright post 104a is separated from the fixing hole 202b, and at this time, the mounting shaft 201 is pulled out, so that the plug 202 can be easily detached without being limited.

It is important to note that the construction and arrangement of the present application as shown in a variety of different exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters (e.g., temperature, pressure, etc.), mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter described in this application. For example, elements shown as integrally formed may be constructed of multiple parts or elements, the position of elements may be reversed or otherwise varied, and the nature or number of discrete elements or positions may be altered or varied. Accordingly, all such modifications are intended to be included within the scope of present invention. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. In the claims, any means-plus-function clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present inventions. Therefore, the invention is not limited to the specific embodiments, but extends to various modifications that nevertheless fall within the scope of the appended claims.

Furthermore, in an effort to provide a concise description of the exemplary embodiments, all features of an actual implementation may not be described (i.e., those not associated with the best mode presently contemplated for carrying out the invention, or those not associated with practicing the invention).

It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure.

It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered in the scope of the claims of the present invention.

Claims

1. The utility model provides a polishing device for hydraulic turbine blade which characterized in that: comprising the steps of (a) a step of,

a polisher (100) provided with an output shaft (101), wherein the output shaft (101) is driven by a motor, and a mounting hole (101 a) is formed in the end part of the output shaft (101);

-a connection assembly (200) comprising a mounting shaft (201), said mounting shaft (201) being provided with a connection post (201 a) cooperating with said mounting hole (101 a);

the polishing assembly (300) comprises a connecting shaft (301) fixedly connected with the mounting shaft (201), a polishing disc (302) connected with the connecting shaft (301), a connecting groove (302 a) is formed in one end face of the polishing disc (302), and the connecting shaft (301) is connected with the connecting groove (302 a);

the side of the mounting hole (101 a) is provided with a rectangular groove (101 b), the rectangular groove (101 b) extends to the end face of the output shaft (101), the center of the rectangular groove (101 b) is provided with a hinge groove (101 c), a rotating block (102) is arranged in the rectangular groove (101 b), the center of the rotating block (102) is provided with a rotating shaft (102 a), and the rotating shaft (102 a) is connected with the hinge groove (101 c);

the connecting column (201 a) is provided with a penetrating through hole (201 b) along the radial direction, two bolts (202) are symmetrically arranged in the through hole (201 b), a limiting groove (201 c) is formed in the through hole (201 b), a limiting block (202 a) is arranged at one end of the bolt (202) located in the limiting groove (201 c), and a first spring (203) is arranged between the two limiting blocks (202 a);

a spring groove (101 d) along the radial direction of the mounting hole (101 a) is formed in one end, far away from the mounting hole (101 a), of the rectangular groove (101 b), a second spring (103) is arranged in the spring groove (101 d), and one end of the second spring (103) is in contact with one end of the rotating block (102);

a cylindrical groove (101 e) with the diameter larger than that of the mounting hole (101 a) is further formed in the output shaft (101), a movable disc (104) is arranged in the cylindrical groove (101 e), and two upright posts (104 a) are arranged on one end face of the movable disc (104);

two insertion holes (201 d) penetrating through the limiting grooves (201 c) are formed in the end portions of the connecting columns (201 a), and the distance between the two insertion holes is consistent with the distance between the two upright columns (104 a);

the side surface of the cylindrical groove (101 e) is provided with a guide groove (101 f) extending along the axial direction, and the side surface of the movable disc (104) is provided with a guide block (104 b) embedded in the guide groove (101 f);

a third spring (105) is arranged between the movable disc (104) and the bottom of the cylindrical groove (101 e);

the limiting blocks (202 a) are provided with fixing holes (202 b), and when the limiting blocks (202 a) are furthest away from each other, the fixing holes (202 b) are coaxial with the insertion holes (201 d) and the upright posts (104 a).

2. The polishing device for a turbine blade according to claim 1, wherein: the connecting shaft (301) is provided with a through chute (301 a) along the radial direction at the tail end, two bayonet locks (303) are symmetrically arranged in the chute (301 a), the end part of the bayonet locks (303) far away from the axis of the connecting shaft (301) is provided with a chamfer to form a wedge shape, and an elastic piece (304) is arranged between the two bayonet locks (303).

3. The polishing device for a turbine blade according to claim 2, wherein: the side surface of the connecting groove (302 a) is provided with a clamping pin hole (302 b).

4. A polishing apparatus for a turbine blade according to claim 3, wherein: the connecting shaft (301) is internally provided with a circular groove (301 b), the bayonet lock (303) is connected with a cylindrical pin (303 a), and the cylindrical pin (303 a) is positioned in the circular groove (301 b).

5. The polishing device for a turbine blade according to claim 4, wherein: the round groove (301 b) is internally provided with a moving part (305), one end face, close to the bayonet lock (303), of the moving part (305) is provided with a conical groove (305 a), and the cylindrical pin (303 a) is located in the conical groove (305 a).

6. The polishing device for a turbine blade according to claim 5, wherein: the end of the cylindrical pin (303 a) is provided with a conical boss (303 b), and the conical boss (303 b) is in side contact with the conical groove (305 a).

7. The polishing device for a turbine blade according to claim 6, wherein: the connecting shaft (301) is provided with an annular groove (301 c) on the outer side, an annular ring (306) is arranged in the annular groove (301 c), a strip-shaped groove (301 d) is arranged between the annular groove (301 c) and the circular groove (301 b), a spiral groove (306 a) is formed in the inner side of the annular ring (306), an adjusting pin (305 b) is arranged on the side face of the moving part (305), and the adjusting pin (305 b) penetrates through the strip-shaped groove (301 d) to be embedded into the spiral groove (306 a).